Concatenated pointers for radio frequency identification tags
AssigneeSymbol Technologies, Inc.
InventorFrederick Schuessler
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for improved protection of radio frequency identification tag memory by using two or more “brownout-safe” pointer registers (instead of a single pointer register) that are logically concatenated to form a complete address for the boundary between a locked portion and an unlocked portion of the tag memory. A first pointer is a coarse pointer identifying a block of memory containing the boundary. A second pointer is a fine pointer identifying a specific location within the identified coarse block of memory. The coarse pointer may be a gray-coded or linear pointer. Similarly, the fine pointer may be a gray-coded or linear pointer.
Claims8
A radio frequency identification (RFID) tag, comprising:
- an antenna;
- a memory having a locked portion and an unlocked portion, wherein a boundary between the locked portion and the unlocked portion is identified by a coarse pointer concatenated with a fine pointer, wherein the fine pointer is a gray-coded pointer;
- a first register storing the coarse pointer;
- and
- a second register storing the fine pointer.
A radio frequency identification (RFID) tag, comprising:
- an antenna;
- a memory having a locked portion and an unlocked portion, wherein a boundary between the locked portion and the unlocked portion is identified by a coarse pointer concatenated with a fine pointer, wherein the fine pointer is a linear pointer;
- a first register storing the coarse pointer;
- and
- a second register storing the fine pointer.
Dependencies are inferred from the claim text.